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Garcia Barriocanal, Javier and Cezar, J. C. and Bruno, Flavio Yair and Thakur, P and Brookes, N. B. and Utfeld, C. and Rivera Calzada, Alberto Carlos and Giblin, S. R. and Taylor, S. W. and Duffy, J. A. and Dugdale, S. B. and Nakamura, T. and Kodama, K. and León Yebra, Carlos and Okamoto, S. and Santamaría Sánchez-Barriga, Jacobo (2010) Spin and orbital Ti magnetism at LaMnO3/SrTiO3 interfaces. Nature communications, 1 . ISSN 2041-1723
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Official URL: http://dx.doi.org/10.1038/ncomms1080
Abstract
In systems with strong electron-lattice coupling, such as manganites, orbital degeneracy is lifted, causing a null expectation value of the orbital magnetic moment. Magnetic structure is thus determined by spin–spin superexchange. In titanates, however, with much smaller Jahn–Teller distortions, orbital degeneracy might allow non-zero values of the orbital magnetic moment, and novel forms of ferromagnetic superexchange interaction unique to t_2g electron systems have been theoretically predicted, although their experimental observation has remained elusive. In this paper, we report a new kind of Ti^3+ ferromagnetism at LaMnO_3/SrTiO_3 epitaxial interfaces. It results from charge transfer to the empty conduction band of the titanate and has spin and orbital contributions evidencing the role of orbital degeneracy. The possibility of tuning magnetic alignment (ferromagnetic or antiferromagnetic) of Ti and Mn moments by structural parameters is demonstrated. This result will provide important clues for understanding the effects of orbital degeneracy in superexchange coupling.
Item Type: | Article |
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Additional Information: | © 2010 Macmillan Publishers Limited. |
Uncontrolled Keywords: | Multidisciplinary sciences |
Subjects: | Sciences > Physics > Electricity |
ID Code: | 33492 |
Deposited On: | 07 Oct 2015 17:52 |
Last Modified: | 11 Nov 2022 18:47 |
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